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Title:	First operational experience with a high-pressure tunnel with innovative lining methods / Erste Betriebserfahrungen bei einem Hochdruckstollen mit innovativen Ausbaumethoden
Abstract:	A tunnel lining system of glass fibre reinforced (GRP) was used for the first time for the construction of the Feldsee pumped storage power station - integrated in the Fragant power station group of KELAG-Kärntner Elektrizitäts-AG. This innovative solution, together with the prestressed concrete backfilling, required more elaborate planning and very exact monitoring during construction, but proved considerably more cost effective compared to classic steel armouring. One of the most important questions was how the new system would overcome formation water pressure. The drainage of the tunnel after 20 months of operation has made it possible to gain the first practical experience and the conformation of the system. Beim Bau des Pumpspeicherkraftwerks Feldsee - integriert in die Kraftwerksgruppe Fragant der KELAG-Kärntner Elektrizitäts-AG - kam erstmals eine Stollenpanzerung aus glasfaserverstärktem Kunststoff (GFK) zur Anwendung. Diese innovative Lösung im Zusammenhang mit dem vorgespannten Hinterfüllbeton erforderte eine aufwendigere Planung und ein sehr genaues Monitoring während der Ausführung, war aber im Vergleich zur klassischen Stahlpanzerung erheblich kostengünstiger. Eine der Kernfragen war die Beherrschung des Gebirgswasserdrucks mit dem neuen System. Anlässlich einer Stollenentleerung nach 20monatiger Betriebszeit konnten erste praktische Erkenntnisse gewonnen werden, die das System bestätigten.
Source:	Geomechanics and Tunnelling 4 (2011), No. 2
Page/s:	129-140
Language of Publication:	English/German

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